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Does the alarm siren sound when you activate the "panic" feature via the red button on the remote. If it does not then you need to gain access to the alarm siren which is located in the left side of the trunk behind the trim. When you have access to the siren it is possible to check for inputs (power and ground) to the siren. A multimeter will give an on/off power reading when the panic mode is activated. If the siren is not receiving a signal then there is a break in the wiring between the comfort control module and the siren. If the alarm does activate then it is possible that the lock alert feature has been disabled. I use a scan tool to access the comfort system module in order to be able to change the adapted features for the remote system.

If you have any further questions or need some clarification, please ask. Max

I asked you to check the operation of the panic feature to see if you had a problem with the siren or with the adaption in the comfort control module. You have ruled out the siren (horn) by using the panic feature to make this component sound off.

The panic feature and the alarm armed confirmation are signaled via the same horn, located in the left rear of the vehicle. This siren (horn) is controlled by the comfort system control module which is responsible for the remote features. What you need to do is take the vehicle to a shop or somebody who is able to access the comfort system control module in order to change the adaption of the alarm activation signalling. You are able to program the comfort system to sound the siren (the beep you hear) when the vehicle is locked or unlocked just as you can turn this activation/deactivation signal off. You can also deactivate or activate the turn signal confirmation (lights blink when the alarm is armed.

I hope that this clears up any confusion you have. It is possible to lose the alarm confirmation if the key remotes or the vehicle battery have been replaced. Max

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.